Q235钢表面涂覆含碳酸钙和石墨烯无机富锌涂层的耐蚀性能

石文龙, 赵 野, 吴青华, 杨 意, 何 壮, 陈羽阳, 罗 瑶, 黄莹莹, 刘 畅, 李宇春

doi:10.16577/j.issn.1001-1560.2022.0208

材料保护 >

2022 , Vol. 55 >Issue 8: 8 - 15

DOI: https://doi.org/10.16577/j.issn.1001-1560.2022.0208

涂料涂装专栏

Q235钢表面涂覆含碳酸钙和石墨烯无机富锌涂层的耐蚀性能

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(长沙理工大学化学与食品工程学院，湖南长沙 410114)

李宇春(1972-)，教授，博士，研究方向为材料的腐蚀及分析，E - mail:iamiyc@263.net

收稿日期: 2022-02-22

修回日期: 2022-03-21

录用日期: 2022-04-19

网络出版日期: 2023-12-17

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Corrosion Resistance of Inorganic Zinc - Rich Coating Containing Calcium Carbonate and Graphene Applied on the Surface of Q235 Steel

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(School of Chemistry and Food Engineering, Changsha University of Science and Technology, Changsha 410114, China)

Received date: 2022-02-22

Revised date: 2022-03-21

Accepted date: 2022-04-19

Online published: 2023-12-17

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摘要

Q235钢以其高性能、低价格的优势在基建行业被广泛应用，但是该材料无论是在陆地大气环境还是在海边的高盐雾环境中都很容易发生腐蚀。在海洋领域，无机富锌涂料是最常用的防腐导电涂料，目前在其改性研究领域仍有很大前景，为提高其耐蚀性能，在无机富锌涂料中添加2%石墨烯+2%碳酸钙，通过模拟海水浸泡试验和模拟海盐气溶胶试验，再结合电化学阻抗(EIS)、扫描电镜(SEM)以及X射线衍射(XRD)等分析方法考察了其腐蚀行为。结果表明：在无机富锌涂料中添加2%石墨烯+2%碳酸钙，其涂层相较未添加的涂层具有较高的阻抗值，且腐蚀电流密度相对较低，产生的涂层氧化产物阻止了腐蚀介质的侵入，减缓了腐蚀的发生，添加了2%石墨烯+2%碳酸钙的无机富锌涂层相较未添加的涂层具有更优异的耐蚀性能。

关键词： 模拟海水; 电化学测试; Q235钢; 无机富锌涂料; 碳酸钙; 石墨烯; 耐蚀性能

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石文龙, 赵野, 吴青华, 杨意, 何壮, 陈羽阳, 罗瑶, 黄莹莹, 刘畅, 李宇春 . Q235钢表面涂覆含碳酸钙和石墨烯无机富锌涂层的耐蚀性能[J]. 材料保护, 2022 , 55(8) : 8 -15 . DOI: 10.16577/j.issn.1001-1560.2022.0208

Abstract

Q235 steel is widely used in the infrastructure industry due to its high performance and low price, but it is prone to corrode in both terrestrial atmospheric environment and high salt fog environment at the seaside. In the marine field, inorganic zinc - rich coatings are the most commonly used anticorrosive conductive coatings, and the modification research on such coatings is promising. In this paper, the coatings were added with 2% graphene + 2% calcium carbonate for the purpose of improving corrosion resistance. Subsequently, the corrosion behaviors of the as - prepared coatings were investigated through simulated seawater immersion experiments and simulated sea salt aerosol experiments with the help of electrochemical impedance (EIS), scanning electron microscopy (SEM) and X - ray diffraction (XRD) analysis. Results showed that in the comparison of the original formula coating, the coating added with 2% graphene and 2% calcium carbonate possessed higher impedance value and lower corrosion current density. In addition, the generated corrosion products prevented the intrusion of corrosive medium and slowed down the corrosion. In general, the inorganic zinc - rich coating added with 2% graphene + 2% calcium carbonate had better corrosion resistance compared with the original formula coating.

Key words： simulated seawater; electrochemical test; Q235 steel; inorganic zinc - rich coating; calcium carbonate; graphene; corrosion resistance

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